The protoss are telepaths, presumably the listener hears in whatever language they know.
Note, however, that they do have a language of sorts, that can be both written and vocalized. The latter is puzzling, since Protoss have no vocal cords.
The zerg, being a hive-mind, has no need for language.
Only the rare sentient Infested Terrans have been known to occasionally communicate with other species.
Protoss do Class 6 type to get rid of the zerg. The planet is covered with plasma and magma when they're done. Nothing gonna be living in that mess.
Terrans also demonstrated a capacity to do this, by launching numerous nukes from orbit and reducing the surface of the planet to a black glassy substance. This led to the outlawing the manufacturing of full-size nukes to prevent such an event occurring again, leading to the multiplayer usage of "mini-nukes" that inflict underwhelming damage at relatively cheap cost.
Executor Tassadar may have actually done this after destroying the zerg overmind in a void-channeled/infused kamikaze attack, quoted stating that "I have not tasted death, nor shall I".
Base on Wheels: One of the major Terran advantages. Their command base and primary production facilities are all capable of being lifted up off the ground and moved to other locations, either if there's an imminent enemy attack or if they just need to move to an area with better resources. Technically they don't roll on the ground as per standard for this trope, but they're not able to be used as bases until they touch down, and their movement speed is pretty slow.
Bizarre Alien Biology: Protoss and Zerg can survive in hard vacuum unprotected, apparently.
According to the second book in The Dark Templar Trilogy, Protoss are photosynthetic.
Note that some strains of Zerg are actually derived from various species that the Swarm encountered and consumed throughout the Galaxy. The Hydralisks were once the herbivorous Slothien herd animals, the Mutalisks were Mantis Screamers, and the Leviathans used to be peaceful Space Whales.
Convection Schmonvection: Magma tiles in the Ashworld tileset (e.g. Char) act exactly like water tiles on any other tileset, and no units take damage from being nearby. This may be justified though: the Terrans are all either in vehicles or wearing Powered Armor (which we know can survive hard vacuum, so being heat-resistant isn't much of a stretch), the Protoss have shields and probably other applicable phlebotinum, and the Zerg originally evolved on a similar planet.
Crapsack Universe: The individual factions all suck one way or the other, the only genuinely nice, trustworthy people are the individuals with no real power.
Terrans act somewhat like locusts, moving from world to world to drain the resources and most of their standing military consists of mind-controlled convicts. Of their governments, the Confederacy was corrupt to its core, the Dominion is slightly better but compensates with its Emperor's extreme narcissism, and the UED are Space Nazis.
The lesser governments are the Kel-Morian Combine and the Umojan Protectorate. The Kel-Morian Combine has been compared to massive criminal organization, and is said to practice slavery. The Umojan Protecorate is apparently the only good government, but it is undeveloped and supposedly has a large spy network.
Crystal Spires and Togas: The Protoss are a near-literal example. Khaydarin crystals are featured heavily in their architecture due to them acting as a conduit for psionic energy, and out of battle the Protoss wear simple cloth garments like loincloths, cloaks and capes.
Starcraft II also uses the game engine for some pretty high-end cutscenes, that are only inches below the actual cinematics.
Damage Is Fire: Terran and Protoss buildings burn. Zerg buildings bleed. Terran buildings on fire take further damage from it until it's destroyed or sufficently repaired. The heaviest the damage, the more widespread the fire/blood.
Deflector Shields: Personal type. Every protoss unit has them. In some of the games, some Terran units can create a Defensive Matrix for friendly units or create their own.
Doomed by Canon: One of the novels "I, Mengsk," goes into the details of Arcturus Mengsk's past, including his homeworld of Korhal and his family. People who are familar with the story of the games know what happens to Korhal and the Mengsk clan.
Earth-Shattering Kaboom: The Protoss doctrine for dealing with a Zerg-infested world goes something like "burn it from orbit until everything on the surface is dead." This is how the Terrans first found out that aliens existed: a Protoss fleet appeared near the planet Chau Sara and blasted it without warning or explanation.
Evil Counterpart: The Zerg were deliberately engineered by the Xel'Naga to be an opposite of the Protoss as part of their experiments. The Protoss have "purity of form" while the Zerg have "purity of essence." The Protoss use a telepathic link that connects all of them, the Zerg are a Hive Mind. The Protoss are graceful and intelligent, the Zerg are bestial and driven by instinct. Even in battle they use opposite techniques, the Protoss army consisting of singular elite soldiers who have spent years training forwar, against the Zerg army consisting of lots and lots of expendible units evolved to be killing machines.
Of course, this is only a superficial interpretation. The Dark Templar novels reveal that the "Turned Against Their Masters" gig is a Protoss fabrication. The Zerg and Protoss were created in order to unite with each other and create a new iteration of the Xel'Naga (it's just how those guys worked) as part of their life-cycle. The Zerg got corrupted by an Eldritch Abomination before that could happen, however, and were made to attack their makers and the Protoss.
Evil Is Visceral: Aspects of the Zerg that do not fit neatly into other tropes: the way that buildings pulsate when they are being constructed, their sound effects (especially if liquids are involved), the Overmind's influence is represented by a big eye. Then there's the growing tissue sample in Starcraft II...
Expanded Universe: In the form of paperback novels and graphic novels.
Terrans are Balanced. They have all the guns, with only one melee unit (the Firebat) and the unit with the longest firing range (the Siege Tank), but their units can be Glass Cannons in compensation. They have the best standing defenses in the form of Bunkers, which you can hide infantry in, and some of their buildings can take off and fly to other locations, but at the cost of subverted Critical Existence Failure: Damage Is Fire, and if a Terran building's Life Meter is reduced far enough, it will burn down of their own accord unless repaired. Finally, the Terran military is less mobile as a whole; their units are Master of None, they need to rely on each other for support, and they have to either leave some units at home or leave their base undefended.
The other two races can only build one unit at a time from their production facilities, and each facility is limited to a single style of unit: barracks can't make airplanes, for instance, and airports can't make soldiers. The Zerg have only one facility that can build any type of unit currently available, three at a time
Protoss are Powerhouse, focusing on an Elite Army of expensive-but-powerful soldiers. They have impressive psionic powers which they have combined with technology (psytech?), the best Squishy Wizards in the franchise, and some units which are completely-automated robots. They have Deflector Shields which regenerate over time, supplementing their already-high Hit Points. All Protoss buildings must be built near a "Pylon." They can't be built outside a Pylon's radius, and they stop functioning if all nearby Pylons are destroyed. Pylons also raise your Arbitrary Headcount Limit. They are the Protoss' least-durable building. Having said that, the Worker Unit simply opens a Portal Door (through which the building teleports) and then can wander off to do other things, instead of having to stay temporarily (Terran) or permanently (Zerg), so it's relatively easy to plunk down a whole new batch of Pylons if things go south.
It's also interesting to compare each faction's basic units. Terrans have the Marine, who has has the lowest Hit Points of the lot*
40 in SC 1, 45 in SC 2 with an upgrade to give them 10 more
, but carries a gun against the other units' melee attacks. The Zergling is a four-legged beast, but has the fastest movespeed of the three units and is so cheap that Zerg players get two of them for the cost of one Marine*
with 35 HP each, for a total of 70
. Finally, Protoss have the Zealot, who has the most HP*
100 HP, 50 shields
and does the most damage per attack, but costs twice the resources, twice the Supply points, and takes up twice the room aboard a dropship.
Fantastic Rank System: The Protoss have a different rank structure, though only three ranks are ever mentioned in the original game:
Praetor: Probably close to an Army Captain, Fenix held this rank.
Executor: Probably close to a Brigadier (1-star) General; Tassadar, Artanis, and Selendis held this rank.
Judicator: A high-ranking government official, Aldaris held this rank.
Prelate: The Dark Templar equivalent of either Praetor or Executor. Zeratul was addressed as such in Brood War.
Starcraft II introduces cosmetic ranks for any standard unit based on number of kills. For Protoss, 0-4 kills is a Disciple, 5-9 is a Mentor, 10-14 an Instructor, 15-19 a Master, and 20+ an Executor. Zerg equivalents are Predator, Slayer, Ravager Assassin and Metamorph, and while hardly fantastic, for the sake of completion, Terran get Recruit, Corporal, Sergeant, Captain, Commander.
The Protoss and Terrans have FTL Warp drives, while the Zerg Overmind can use its massivePsychic Powers to tear warp rifts in spacetime.
Protoss have near-instantaneous precision warps, to the point that their buildings, infantry and ships are not "built" but are warped in from their homeworld or automated factories. Protoss soldiers even have armor that teleports them out when they are gravely wounded in battle.
The arrival of the Terrans in Koprulu was actually a navigational accident. The flight computers on their sleeper FTL ships malfunctioned, and overshot their destination, travelling at FTL speeds for about 30 years (adding up to some 60,000 light-years from Earth)
Over time, the Earth Directorate has managed to advance FTL technology to allow them to get to the Koprulu Sector from Earth in a matter of months.
Future Slang: The novels introduce "fekk" as a curse word.
Of course, 'feck' is contemporary British slang.
Gambit Pileup: The entire storyline. Every major character in this game, human or otherwise, seems to have some sort of hidden agenda and it's nigh-impossible to tell who's getting the upper hand. Mostly, it doesn't work out well for anybody.
Genocide Backfire: The Terrans in the Koprulu sector were descendants of unwanted people on Earth who were sent on hardly inhabitable places to test if they could survive. They can.
It should be noted that the genocide might not have backfired if the sleeper ships hadn't missed their destinations.
Hammerspace: Terrans have building components appear and snap themselves together out of thin air.
Hive Mind: The zerg Swarm, obviously. The Khala of the protoss is also somewhat like this, only the protoss in the Khala retain their individuality and free will, and can choose not to share all of their thoughts and feelings with others.
Humans Are Special: Deconstructed. The Terrans of the Koprulu Sector are only a few generations away from becoming a psionic species. Instead of indicating that humanity is on the verge of becoming something greater, this just means they drew the attention of the Zerg, who view their psionic potential as the key to fighting their real target, the Protoss, on equal grounds.
Humans by Any Other Name: For all intents and purposes the term "Terran" is used as a substitute, both by humans and by non-humans, for the word human. This is particularly odd since Earth (except for in the expansion) is practically a non-factor and the word Protoss has nothing at all to do with the name of the protoss homeworld (Aiur). As for the Zerg, it's unclear if they're named after Zerus (given the unusual spelling) or whether Zerus is named after them.
Hufflepuff House: Both the Kel-Morian Combine and the Umojan Protectorate get no screentime in the original game, beyond a blurb in the manual. The Combine was later elaborated on in Brood War, but Umoja still has yet to make an appearance.
Instant-Win Condition: In the multiplayer; you win the game if you destroy every building the enemy player controls, even if your own base is in shambles and you're on your last unit. There is a reason for this: During the beta for the first game, a very common dirty trick was for a losing player to hide a very difficult to spot unit such as a burrowed zergling in an obscure part of the map in hopes that the opponent would give up and cede the game in frustration.
Planet "Char" didn't earn its name by being a planet of rainforests and crystal blue oceans.
Protoss means "first born" in the language of the Xel'naga, and is derived from the Greek word πρωτος, which is pronounced the same way and means "first".
Neglectful Precursor: Early on, it's revealed that the Xel'Naga were trying to create a perfect race: The Protoss were a failed experiment, but they succeeded with the Zerg, up until the point where they got eaten.
In the Dark Templar novels, however, it's revealed that the Xel'Naga were done with the Protoss; they had completed their work and left to create the Zerg as a complementary species, which would have, in time, joined with the Protoss to create the Xel'Naga's descendants. Someone screwed that gig up, though.
Nice Job Breaking It, Hero: Repeatedly. To their credit though, they are usually aware of it and are appropriately horrified.
Raynor, and the Player Character, help Mengsk defeat the Confederacy; only for Mengsk to prove himself to be just as bad as the Confederacy and proclaim himself Emperor.
In the end of the Protoss campaign in Brood War, the Protoss acknowledge that by using that Xel'Naga temple to destroy the Zerg on Shakuras they will greatly weaken Daggoth's forces, which in turn will help Kerrigan. They also state though that doing so is the only way that they will survive.
Zeratul's killing of Zasz was the first time a Cerebrate actually died, but it also linked his mind with the Overmind and revealed the location of Auir. Zeratul later killed the second Overmind ending the UED's control of the Zerg, which meant that Kerrigan then had complete control of all the Zerg.
The uniforms worn by United Earth Directorate officers resemble Nazi uniforms, right down to the grey overcoats and hats. Oddly, their bosses are a Frenchman and a Russian.
The UED gets bonus points for using the same interior decorators as Nazi Germany. Both have red flags with similar symbolism; the UED shows an eagle atop the Earth, echoing the Third Reich's eagle atop the swastika.
How about their predecessor, the United Powers League, who rounded up all cyborgs, mutants, punks and "undesirables" from Earth and either killed them of shot them off into space?
The Remnant: The Confederacy just won't seem to go away after being defeated by Mengsk. The UED still has pockets of forces left behind in the sector. Groups of both go to work as mercenaries. The novels also mention other rebel groups that fought the Confederacy separately...and then went right on to fight the Dominion, since it wasn't any improvement.
The Republic: The Umojan Protectorate, which of all the major Terran states seems to be the only one that's consistently "good".
Justified for the Protoss, who warp in their structures and units already constructed from somewhere else.
Justified for the Terrans; all their buildings are prefabricated, and Starcraft II's better animations show that the SCV is operating an assembly armature that is included in the building kit, rather than welding the whole thing together by hand.
Schedule Slip: Anytime Blizzard issues a release date for a full game.
The novel Starcraft: Ghost: Spectres has been delayed so long and for so many times, it's aping the Vapor Ware game it's based on.
Sci-Fi Writers Have No Sense of Scale: When the Terrans first arrived to the Koprulu sector, they only numbered approximately 32,000. According to Blizzard's website, there are at least twelve billion Terrans in the Koprulu sector at the beginning of Starcraft II, and Raynor mentions Kerrigan killing eight billion people during the first game. He might have been including the Protoss but that still means you're looking at more than twelve billion humans living in the sector. As mentioned here, to have this many people after only 240 years would require the population to at least double every decade, for 24 decades, not taking into account the deaths that occur from any number of natural and unnatural causes, because the Terrans have a history of civil wars.
Sequel Hook: Dark Origin. Which is notable due to the level being a unlockable secret. Unless you finished the previous mission within a certain amount of time, the player would never learn about the plot.
Shoot The Shaggy Dog Story: By the end of Brood War, the Confederacy was replaced by the equally rotten Terran Dominion, which was then devastated by the UED and the Kerrigan. The Zerg invaded Auir, were stopped, but killed virtually the whole population first. The Protoss evacuated to Shakuras, but were still devastated and lost their leaders. The UED conquered the sector, but were defeated and wiped out by Kerrigan. The Zerg created a second Overmind (virtually undoing Tassadar's sacrifice), which was then killed. In the end, Kerrigan is the ruler of the sector, and the heroes have been defeated in virtually every way.
Stuff Blowing Up: Everything explodes. This is most obvious with the zerg, in that killing their living buildings results in the building splattering spectactularly in a shower of blood.
Suspiciously Small Army: Rampant, in quite a few missions your enemies have very small armies, or at least small armies that you see. The later missions have larger bases with more troops, but you're still not going to be seeing enemy forces number in the thousands like you would expect from an actual army.
Tactical Rock-Paper-Scissors: Exaggerated. In addition to some units only being able to hit airborne or ground-going enemies, attack damage gets boosted or blunted depending on the opposing unit's physical size (small vs large); the sequel also added bonuses against unit composition (biological vs armored); and, always, lots of small cheap units can easily gang up on a large expensive one. The end result is a tangled web of counters, with each unit being specifically strong against several others and being weak to several more.
Themed Cursor: A sonar-like thing whose color changes depending on the alignment of whatever you're hovering it over. Green, yellow and red are friendly, neutral and enemies.
Turned Against Their Masters: Both the protoss and the zerg, against the Xel'Naga; the protoss merely shooed them away from their world, while the zerg killed most of them. The Protoss rebellion was just as violent as the Zerg's was. The only difference is the Zerg were all working towards assimilation of the Xel'Naga, and the Protoss were just killing anything that moved, including themselves. A good number of Xel'Naga were killed during the Protoss uprising.
Unobtainium: Neosteel, Khaydarin crystals and both Vespene Gas and "minerals".
Vestigial Empire: The Protoss empire, apparently even before the invasion of Aiur. It's implied this is because they've been fighting the Zerg for many years and are losing.
A Villain Named Zrg: To quote that page, "What four tropers out of five thought when seeing the title."
Walk It Off: Any Zerg unit or building slowly regenerates health. Protoss also slowly recharge their shields over time, which can make up between half to about ninty percent of their total effective health.
Weak Turret Gun: Encountered frequently in installation missions.
With Great Power Comes Great Insanity: Tends to happen to humans with high psi levels if not restrained quickly. The novels also provide this in device form, which blocks any attempts at mind reading at the cost of the user going slowly mental if it's used for more than a couple of hours. Which happens to both characters that had been using them for selfish reasons.